/Engine/Source/Runtime/RenderCore/Public/Shader.h
void SaveShaderStableKeys ( const [FShaderMapBase](API\Runtime\RenderCore\FShaderMapBase) & InShaderMap, EShaderPlatform TargetShaderPlatform, const struct [FStableShaderKeyAndValue](API\Runtime\RenderCore\FStableShaderKeyAndValue) & SaveKeyVal )